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CN-122024616-A - HDR brightness improving method of display panel, driving chip and display device

CN122024616ACN 122024616 ACN122024616 ACN 122024616ACN-122024616-A

Abstract

The embodiment of the application provides an HDR brightness enhancement method of a display panel, a driving chip and a display device, and the application provides the HDR brightness enhancement method of the display panel, which comprises the steps of calculating the average pixel level of an initial display picture; the method comprises the steps of obtaining the lifting multiple of an initial maximum brightness level of an initial display picture by indexing in a multiple lifting table, indexing updated gray scales of sub-pixels in a remapping gray scale table, obtaining updated brightness values by indexing a plurality of sub-pixels in the initial display picture in the gray scale mapping table according to the updated maximum brightness level and the updated gray scales, and obtaining a target display picture by updating luminous brightness by the plurality of sub-pixels according to the updated brightness values. The application provides a method for improving the brightness level and contrast of the display panel by using the index, which comprises a multiple lifting table, a remapping gray scale table and a gray scale mapping table, so that the index obtains the maximum brightness level adjusted to the initial display picture and the updated brightness value of the most sub-pixel, thereby being beneficial to improving the brightness level and contrast when the display panel displays the picture and improving the HDR brightness of the display panel.

Inventors

  • YE SHUAI
  • Yan Yinzhe
  • ZHANG LINZHENG
  • Cao Zhongtao
  • LU LIZHU

Assignees

  • 武汉天马微电子有限公司

Dates

Publication Date
20260512
Application Date
20260318

Claims (20)

  1. 1. A method for HDR luminance enhancement of a display panel, the method comprising: Calculating the average pixel level of the initial display picture; obtaining the lifting multiple of the initial maximum brightness level of the initial display picture according to the average pixel level of the initial display picture and the initial maximum brightness level of the initial display picture by indexing in a multiple lifting table; The display panel comprises a plurality of sub-pixels, and the updated gray scale of the sub-pixels is indexed in a remapping gray scale table according to the initial gray scale of the sub-pixels in the initial display picture and the average pixel level of the initial display picture; And a plurality of sub-pixels in the initial display picture obtain updated brightness values according to the updated maximum brightness level and the updated gray scale indexes in a gray scale mapping table, and the sub-pixels update the luminous brightness according to the updated brightness values to obtain a target display picture.
  2. 2. The method of claim 1, wherein calculating the average pixel level of the initial display comprises: obtaining an average pixel level of the initial display screen based on formula (1); wherein apl= (1); APL is the average pixel level, n is the total number of sub-pixels in the initial display picture, and PixelGray (k) is the initial gray level of the kth sub-pixel in the initial display picture.
  3. 3. The method of claim 1, wherein the indexing the initial maximum luminance level of the initial display in a multiple-up table according to the average pixel level of the initial display comprises: Inputting an average pixel level of the initial display screen and an initial maximum brightness level of the initial display screen into the multiple lifting table; indexing in the multiple lifting table a lifting multiple of the maximum brightness level according to the average pixel level and the initial maximum brightness level in the multiple lifting table; And outputting a lifting multiple of the initial maximum brightness level from the multiple lifting table.
  4. 4. The method of claim 3, wherein in said multiple-boost table, as said average pixel level increases, the multiple of said maximum luminance level increases decreases.
  5. 5. The method of claim 4, wherein the improvement in the maximum brightness level is 1 or more.
  6. 6. The method of claim 3, wherein in the multiple boost table, the maximum brightness level comprises a 1 st-stage maximum brightness level to an nth-stage maximum brightness level; And under the same average pixel level in the multiple lifting table, the lifting multiple of the maximum brightness level is reduced along with the increase of the maximum brightness level between the a-th maximum brightness level and the N-th maximum brightness level, wherein a is more than or equal to 1 and less than or equal to N, and a is an integer.
  7. 7. The method of claim 6, wherein the fold increase for the maximum luminance level is equal as the maximum luminance level increases between a 1 st-order maximum luminance level and an a-st-order maximum luminance level in the fold increase table and at the same average pixel level.
  8. 8. The method of claim 1, wherein the indexing the updated gray level of the sub-pixel in the remapping gray level table according to the initial gray level of the sub-pixel in the initial display screen, the average pixel level of the initial display screen, comprises: Inputting an average pixel level of the initial display picture and an initial gray level of the sub-pixel into the remapping gray level table; the updated gray scale of the sub-pixels is indexed in the remapping gray scale table according to the average pixel level and the initial gray scale in the remapping gray scale table; And outputting the updated gray scale of the sub-pixel from the remapping gray scale table.
  9. 9. The method of claim 8, wherein compressing the number of levels of the initial gray level X times at the same average pixel level in the remapping gray level table results in the number of levels of the updated gray level.
  10. 10. The method according to claim 9, wherein in the remapping gray scale table, the 0 th to M th initial gray scales are included in the initial gray scales, and a gray scale difference between adjacent two stages of the 0 th to M th initial gray scales is 1; The plurality of updating gray scales in the remapping gray scale table comprise at least part of 0 th level updating gray scales to M th level updating gray scales, the gray scale difference of two adjacent levels of updating gray scales in the 0 th level updating gray scales-M th level updating gray scales is 1/Z, and Z is the power of 2.
  11. 11. The method of claim 10, wherein the gray scale mapping table includes 0 th to M-th update gray scales, and wherein a gray scale difference between adjacent two of the 0 th to M-th update gray scales is 1/Z, and Z is a power of 2.
  12. 12. The method of claim 10, wherein the update gray level corresponding to the M-th level of initial gray level is the M-th level of update gray level and the update gray level corresponding to the 0-th level of initial gray level is the 0-th level of update gray level in the remapping gray level table and at the same average pixel level.
  13. 13. The method of claim 9, wherein, in the remapping gray-scale table and at the same average pixel level, P is an integer greater than or equal to 1, the lower the number of levels of the initial gray-scale is, the greater the corresponding compression factor is.
  14. 14. The method of claim 13, wherein the number of steps of the b-th initial gray scale is compressed c times between the P-th initial gray scale and the M-1 th initial gray scale to obtain an e-th updated gray scale at the same average pixel level in the remapping gray scale table; wherein, the P is more than or equal to b is more than or equal to M-1, 0< c≤Z; 0< e < b, and b is an integer, e is an integer multiple of 1/Z.
  15. 15. The method of claim 13, wherein the ratio between the number of levels of the plurality of initial gray levels and the number of levels of their corresponding update gray levels is equal between the 1 st-P-1 st initial gray level in the remapping gray level table and at the same average pixel level.
  16. 16. The method of claim 15, wherein the ratio between the number of levels of the initial gray levels and the number of levels of the corresponding updated gray levels is Z between the 1 st-P-1 st initial gray levels in the remapping gray level table and at the same average pixel level.
  17. 17. The method of claim 10, wherein at the same maximum brightness level in the remapping gray-scale table, the higher the average pixel level, the lower the compression factor corresponding to the number of stages of the initial gray-scale, in addition to the 0 th and M-th initial gray-scales.
  18. 18. The method of claim 1, wherein the plurality of sub-pixels in the initial display panel obtain updated luminance values according to the updated maximum luminance level and the updated gray scale index in the gray scale mapping table, and the plurality of sub-pixels update the light emission luminance according to the updated luminance values to obtain the target display screen, comprising: Obtaining the updated maximum brightness level according to the product of the maximum brightness level of the initial display picture and the lifting multiple; inputting the updated maximum brightness level and the updated gray scale of the sub-pixel into the gray scale mapping table; obtaining an updated brightness value of the sub-pixel in the gray scale mapping table according to the updated maximum brightness level and the updated gray scale index in the gray scale mapping table; And updating the luminous brightness of the plurality of sub-pixels according to the updated brightness values corresponding to the plurality of sub-pixels to obtain the target display picture.
  19. 19. A driver chip comprising the method of any one of claims 1-18.
  20. 20. A display device comprising the driver chip of claim 19.

Description

HDR brightness improving method of display panel, driving chip and display device Technical Field The application relates to the technical field of display, in particular to an HDR brightness improving method of a display panel, a driving chip and a display device. Background HDR (High Dynamic Range) images show the characteristics of higher brightness level, higher contrast and wider color gamut, and have higher visual effect. However, in the related art, when an image with a standard dynamic range (STANDARD DYNAMIC RANGE, SDR) is generally converted into an HDR image, the HDR image is usually obtained by combining a plurality of images with different exposures, such as an SDR image and a monochrome gain map of the image, and such an algorithm for obtaining the HDR image is often included in a camera, and if the algorithm is applied to a real-time display device including a display panel, such as a mobile phone, a computer, and a television, there is a risk of high delay, high ghost liability, and high power consumption. Therefore, the HDR (High Dynamic Range) brightness improvement method applied to the display panel has important significance for realizing the display of HDR images in real-time display devices such as mobile phones, computers, televisions and the like comprising the display panel. Disclosure of Invention In view of the above, the present application provides an HDR luminance improving method, a driving chip, and a display device for a display panel, so as to solve the above-mentioned problems. In a first aspect, the present application provides a method for improving HDR luminance of a display panel, the method comprising: Calculating the average pixel level of the initial display picture; Obtaining the lifting multiple of the initial maximum brightness level of the initial display picture according to the average pixel level of the initial display picture and the initial maximum brightness level of the initial display picture by indexing in the multiple lifting table; the display panel comprises a plurality of sub-pixels, and the updated gray scale of the sub-pixels is indexed in a remapping gray scale table according to the initial gray scale of the sub-pixels in the initial display picture and the average pixel level of the initial display picture; the plurality of sub-pixels in the initial display picture obtain updated brightness values according to the updated maximum brightness level and the updated gray scale index in the gray scale mapping table, and the plurality of sub-pixels update the luminous brightness according to the updated brightness values to obtain the target display picture. In a second aspect, the present application provides a driver chip comprising a method as provided in the first aspect. In a third aspect, the present application provides a display device comprising a display panel as provided in the second aspect. In the application, the display panel comprises a multiple lifting table, a remapping gray scale table and a gray scale mapping table, so that the index obtains the maximum brightness level adjusted to the initial display picture and the updated brightness value of the most sub-pixel, thereby being beneficial to improving the brightness level and contrast when the display panel displays the picture, improving the HDR brightness of the display panel and realizing the adjustment of the initial display picture to a target display picture with a high dynamic range. Further, the multiple lifting table, the remapping gray scale table and the gray scale mapping table are directly called in the display panel to update the brightness values of the sub-pixels of the initial display picture, so that conditions are provided for avoiding the mode of synthesizing the HDR image by using the images with similar multiple exposure delays, the target display picture is directly displayed, the delay in obtaining the HDR image is greatly reduced, and the HDR image is displayed in a real-time display device comprising the display panel such as a mobile phone, a computer and a television. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. FIG. 1 is a flow chart of a method provided by the present application; FIG. 2 is a schematic diagram of a multiple lift table according to the present application; FIG. 3 is a schematic plan view of a display panel according to the present application; FIG. 4 is a diagram of a remapping gray scale table according to the present application; FIG. 5 is a schematic diagram of a gray-scale mapping table according to the present application; FIG. 6 is a flow c